Malicious PDF — malware analysis report

Static analysis result for SHA-256 1742edf91d8d3176…

MALICIOUS

PDF

70.7 KB Created: 2020-09-18 16:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 115069be9be7da0ceb3994e5626a25a2 SHA-1: de0ccff00a0a75734485ad34d301ffe74590a79d SHA-256: 1742edf91d8d317610968e49a7ec9362f815df463a548061c521e718977d2537
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, disguised as an answer key for a worksheet. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the ML classifier also flagged the document as malicious. The document body, though heavily obfuscated, contains the target URL, suggesting an attempt to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/wix?keyword=balancing+chemical+equations+activity+worksheet+answers
    • http://fiwaza.concertinaman.net/uploads/1/3/0/9/130969341/rasapomobapupin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b3ca44f7-61ed-4257-a915-a0a48910b240.filesusr.com/ugd/db93e9_a737b722b9f64b5d8bc58b754a03ed20.pdf?index=true
    • https://6cdcb771-820a-4583-877e-6bea40641132.filesusr.com/ugd/e1d12c_4b4edc50ecb94248ab2dae3473e3e40a.pdf?index=true
    • https://2964bc2f-4658-45f4-8cf7-6cc979b83ca6.filesusr.com/ugd/3724a2_1e47ec14b0394b03b9e7ae4c67fb3d49.pdf?index=true
    • https://031120c1-3afa-46fe-8d40-298fe8e55c24.filesusr.com/ugd/7ef0dc_95b392fcff8441058824e04defb51226.pdf?index=true
    • https://d2b6e167-7465-4e8b-bd01-da1ace4615a1.filesusr.com/ugd/e6092c_2e4b82e1495448aab4ec72152673120e.pdf?index=true
    • https://21960d78-bb27-4133-ac45-efb7c23acef1.filesusr.com/ugd/805d2a_542368ad48564c978c36c697863e263d.pdf?index=true
    • https://d57ec725-3053-4344-8a5e-cf2dd5957164.filesusr.com/ugd/6dcf04_6926e9d497e34a62890e9457983975ed.pdf?index=true
    • https://f3c88d60-59b0-408e-9b13-d883673f7641.filesusr.com/ugd/debbe1_d2c3a4452e61475e81667723a8d719bb.pdf?index=true
    • https://a3de5abb-b8e3-477f-95df-ca3bee7f291e.filesusr.com/ugd/ef0078_d00146b3acff46568ce7d9e1ba0e0ff9.pdf?index=true
    • https://8c3100c0-a3db-41af-b3a3-5090f57acbd0.filesusr.com/ugd/7baf93_99a7c0edcc9f40aabd364947ab8513e4.pdf?index=true
    • https://c7a1986a-4fc0-4552-b8d1-b09c4b2f62e9.filesusr.com/ugd/b48b60_d5d69639a23b4649941bb6970ea828c3.pdf?index=true
    • https://95df3eb9-236d-4360-883c-dc797adfdeef.filesusr.com/ugd/4dd980_425bbe83f2c0444089ee1a5cf4968648.pdf?index=true
    • https://881baf27-2026-43c6-ae78-b84279db2cf1.filesusr.com/ugd/b50c55_576453e4ab2a4040aeeba888f2052f1e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf2.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 2828 bytes
font_01_sfnt_off0000d4ed.bin
41d579efd5bb47e64bcc49c8dffbf9f19b3e459f4e87b7b0dc8bcde991cd17e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 5704 bytes
font_02_sfnt_off0000e84e.bin
bba3a9f496ec6f6c45dd5f9c05dcacd49323a3d0d277728e382aefa19f0980f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 10176 bytes

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